Steam-shovel dipper.



A. IVI. 60W.

STEAM SHOVEL DIFFER.

APPLICATION man nic. 1o. 1911.

Patented Allg.

U m5 NN A To allvwkom it may concern:

. Beit known that I, ALEXANDER M. Gow, a citizen of the United States,and resident of Duluthf'in the county of St. Louis and State fofMinnesota, have invented certain new anduseful Im rovements in Steam-Shovel Dippers, of w ich the following is a specification.

This' invention relates to steam shovel dippers and more articularly todipper fronts.

- One of the o jects of my invention is to improve and simplify dipperfronts to facilltate the. ecient use thereof.

Another object is to improve the connection of teeth to dipper fronts tofacilitate their removal and replacement, and also to revent lateralmovement of the teeth when xed in place. Generally speaking, these andother objects are accomplished by providing a dipper front comprising awall having recesses on the -inside and outside for the receptlon of'abifurcated tooth, thewalls of the recess preventing lateral movement ofthe tooth.

The invention is illustrated on the accompanying sheet of drawings inwhich,

Figure 1 is a top plan view ofthe dipper front; l. Fig, 2 is a frontelevation of the sa e;

Fig. 3 `is a side elevation of the ipper front parts being in section toshow the connection between the front wall of the dipper and one of theteeth; and l5 Fig. 4:' is a detail sectional view on an enlarged scaleshowing the connection between the dipper front and tooth. i

At present it is customary to forge teeth with lar e shanks which extendinto the dipl per on t e inside. Another construction 4is to cast theshank integral with the dipper front. In either case spaces areleftbetween the shanks of the teeth on the inside of the dipper, and thesespaces fill upwith dlrt and Il ice reducing the capacity of the dipperand preventing the free ingress and egress of the material. In. myimproved dlpper front the inside of the dzpper is practically smooth,while-I make plovision on the outside for Il any reinforcing orlstrengthening that may be necessary.

By referring to the `figures .of the draw ings, it will -be noted that Ihave shown a di per vfront .havinga front wall 11 and Il sid; walls 12and 13, the'`- -front wall being the front. The frontportionof each'ofthe i distance from the center lineof the front inside surface.

Bpecmeationot Letters Estant. Patented Aug. 6, 1918. appnmnmee neeembr1c, 1e rr. serial N9. acceso.

somewhat curved." k,Formed integrall 'with f A this front areafpluralit.v ofstrengt enin ribs 14 which are. locat on the outside'oribs is provided witha recess 15 which wi ens "60" 4tovvard the upperend of thev front. he i inslde of the ront also is provided with an Ioppositely arranged duplicate recess 16, the two recesses in each caseformin atongue 17 which tapers outwardly and ts into the 65 bifurcatedportion of the tooth 18.` The upper ends ofthe duplicate recesses. 15and 16 terminate in a notch 19, or it might be said that a U-shapedrecess is provided for the reception of each tooth 18.` The side -wallsand 21 of each recess coperate tol prevent lateral movement of the teethwhen the same are set in place. To securely fasten the teeth to thedipper front,.rivets 22 or their equivalent are passed throughregistering` openings in the bifurcated end of the teeth and theassociated ton es 17 lformed by the recesses 15 and 16. l herecesses 15and 16 at their lower extremities, terminate in shoulders 2 3 againstwhich the ends of the bifurcated portion of the teeth 18 abut, and inview of the fact that the exterior of the bifurcated portions of theteeth are flush with the coperating rib portions a smooth surface isprovided to facilitate the operation of the dipper. v

In view of the fact that the dipper front is curved or concave on theinside, the outer recess 15 in each case is located at a greater thanthe inside recess 16 in each case. It

. will be noted also that the outside recess 15 prrojects farther' fromthe 'surface of the ont than the inside recess does and that the rib onthe outside is in alinement with the 95 recess to act as a runner toprotect the front.

l By means of this arrangement, teeth may be reversed thereby prolongingthe life of the teeth withoutreforging'the same. These teeth are easilyremoved and replaced. The same are held a ainst lateral movement whenset in place an at the same time the dipper front 1s provided with thedesirablesmooth It is my intention to cover all modifications which comewithin the spirit and scope ofthe. following claim.

" What I claim is:

A dipper having a rib on the exterior'of the front thereof, said ribhaving` a longisoV i tudinal recess extending to the top of the confinedbetween the shoulders, and means front and around the upper edge thereofand forsecuring the tooth in place: 12 into the inner side of the frontof the dipper, Signed at Duluth, Minn., this 5th day of the recess beingcontinuous from the eXte- December, A. D. 1917.

5 rior to the interior of the front, uniform, ALEXANDER M. GOW.

and of U shape to form a, solid tongue having Witnesses: lateralshoulders, a, reversible tooth having JOHN E. CARLSON,

jaws to receive said tongue, said aWs being E. J. DILLoN.

